
Modify cookies API externs since it has moved out of experimental.

R=jeffbailey
DELTA=102  (50 added, 50 deleted, 2 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=58006


ajukraine/closure-compiler,olegshnitko/closure-compiler,olegshnitko/closure-compiler,ajukraine/closure-compiler